曼紐爾•卡斯特是美國南加州大學安納伯格傳播學院院長、英國劍橋大學社會學係研究主任、巴黎全球研究學院網絡社會研究主席。他於1979年至2003年間擔任加州大學伯剋利分校規劃和社會學教授；2003年至2013年擔任加泰羅尼亞公開大學互聯網跨學科研究所教授、主任。同時，他也是麻省理工大學技術與社會學院傑齣客座教授、牛津大學互聯網研究傑齣客座教授。卡斯特共著有26本書，其中包括《信息時代：經濟，社會和文化》（Blackwell，1996-2000），已經翻譯成22種語言；《網絡星河》（OUP，2001），已經翻譯成17種語言；以及《憤怒與希望的網絡》（Polity，2012）。他是美國政治和社會科學院、歐洲學院、英國學院、墨西哥科學院和西班牙皇傢經濟學院研究員。他曾獲得18個榮譽博士學位、2010年伊拉斯謨奬章，2012年霍爾伯格紀念奬。他是歐洲研究委員會，以及歐洲創新與技術研究所（EIT）的創始人之一。此外，他也是美國國會圖書館學者委員會成員。

We live in the midst of a revolution in communication technologies that affects the way in which people feel, think, and behave. The media have become the space where power strategies are played out. In the current technological context mass communication goes beyond traditional media and includes the Internet and mobile communication. In this wide-ranging and powerful book, Manuel Castells analyses the transformation of the global media industry by this revolution in communication technologies. He argues that a new communication system, mass self-communication, has emerged, and power relationships have been profoundly modified by the emergence of this new communication environment. Created in the commons of the Internet this communication can be locally based, but globally connected. It is built through messaging, social networks sites, and blogging, and is now being used by the millions around the world who have access to the Internet. Drawing on a wide range of social and psychological theories, Castells presents original research on political processes and social movements, including the misinformation of the American public on the Iraq War, the global environmental movement to prevent climate change, the control of information in China and Russia, and Internet-based political campaigns, such as the Obama campaign in the United States. On the basis of these case studies he proposes a new theory of power in the information age based on the management of communication networks Justly celebrated for his analysis of the network society, Castells here builds on that work, offering a well grounded and immensely challenging picture of communication and power in the 21st century. This is a book for anyone who wants to understand the dynamics and character of the modern world.